A 0.008 mm2 500 μw 469 kS/s frequency-to-digital converter based CMOS temperature sensor with process variation compensation

Sewook Hwang, Jabeom Koo, Kisoo Kim, Hokyu Lee, Chulwoo Kim

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

This paper presents a temperature sensor based on a frequency-to-digital converter with digitally controlled process compensation. The proposed temperature sensor utilizes ring oscillators to generate a temperature dependent frequency. The adjusted linear frequency difference slope is used to improve the linearity of the temperature sensor and to compensate for process variations. Furthermore, an additional process compensation scheme is proposed to enhance the accuracy under one point calibration. With one point calibration, the resolution of the temperature sensor is 0.18°C/LSB and the maximum inaccuracy of 20 measured samples is less than ± 1.5°C over a temperature range of 0°C ∼ 110°C. The entire block occupies 0.008 mm2 in 65 nm CMOS and consumes 500 μW at a conversion rate of 469 kS/s.

Original languageEnglish
Article number6466399
Pages (from-to)2241-2248
Number of pages8
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume60
Issue number9
DOIs
Publication statusPublished - 2013

Keywords

  • Frequency-to-digital converter
  • process variation compensation
  • temperature sensor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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